Saying the words that come from knowledge is no sign of having it.

The knowledge of the soul admittedly contributes greatly to the advance of truth in general, and, above all, to our understanding of Nature, for the soul is in some sense the principle of animal life.

The virtue of the good man is necessarily the same as the virtue of the citizen of the perfect state.

These two rational faculties may be designated the Scientific Faculty and the Calculative Faculty respectively; since calculation is the same as deliberation, and deliberation is never exercised about things that are invariable, so that the Calculative Faculty is a separate part of the rational half of the soul.

We can do noble acts without ruling the earth and sea.

The activity of God, which is transcendent in blessedness, is the activity of contemplation; and therefore among human activities that which is most akin to the divine activity of contemplation will be the greatest source of happiness.

All teaching and all intellectual learning come about from already existing knowledge.